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1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2021, ASPEED Technology Inc.
3// Authors: KuoHsiang Chou <kuohsiang_chou@aspeedtech.com>
4
5#include <linux/firmware.h>
6#include <linux/delay.h>
7
8#include <drm/drm_atomic_state_helper.h>
9#include <drm/drm_edid.h>
10#include <drm/drm_modeset_helper_vtables.h>
11#include <drm/drm_print.h>
12#include <drm/drm_probe_helper.h>
13
14#include "ast_drv.h"
15
16static bool ast_astdp_is_connected(struct ast_device *ast)
17{
18 if (!ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xDF, AST_IO_VGACRDF_HPD))
19 return false;
20 return true;
21}
22
23static int ast_astdp_read_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
24{
25 struct ast_device *ast = data;
26 size_t rdlen = round_up(len, 4);
27 int ret = 0;
28 unsigned int i;
29
30 if (block > 0)
31 return -EIO; /* extension headers not supported */
32
33 /*
34 * Protect access to I/O registers from concurrent modesetting
35 * by acquiring the I/O-register lock.
36 */
37 mutex_lock(&ast->modeset_lock);
38
39 /* Start reading EDID data */
40 ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5, (u8)~AST_IO_VGACRE5_EDID_READ_DONE, 0x00);
41
42 for (i = 0; i < rdlen; i += 4) {
43 unsigned int offset;
44 unsigned int j;
45 u8 ediddata[4];
46 u8 vgacre4;
47
48 offset = (i + block * EDID_LENGTH) / 4;
49 if (offset >= 64) {
50 ret = -EIO;
51 goto out;
52 }
53 vgacre4 = offset;
54
55 /*
56 * CRE4[7:0]: Read-Pointer for EDID (Unit: 4bytes); valid range: 0~64
57 */
58 ast_set_index_reg(ast, AST_IO_VGACRI, 0xe4, vgacre4);
59
60 /*
61 * CRD7[b0]: valid flag for EDID
62 * CRD6[b0]: mirror read pointer for EDID
63 */
64 for (j = 0; j < 200; ++j) {
65 u8 vgacrd7, vgacrd6;
66
67 /*
68 * Delay are getting longer with each retry.
69 *
70 * 1. No delay on first try
71 * 2. The Delays are often 2 loops when users request "Display Settings"
72 * of right-click of mouse.
73 * 3. The Delays are often longer a lot when system resume from S3/S4.
74 */
75 if (j)
76 mdelay(j + 1);
77
78 /* Wait for EDID offset to show up in mirror register */
79 vgacrd7 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd7);
80 if (vgacrd7 & AST_IO_VGACRD7_EDID_VALID_FLAG) {
81 vgacrd6 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd6);
82 if (vgacrd6 == offset)
83 break;
84 }
85 }
86 if (j == 200) {
87 ret = -EBUSY;
88 goto out;
89 }
90
91 ediddata[0] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd8);
92 ediddata[1] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd9);
93 ediddata[2] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xda);
94 ediddata[3] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xdb);
95
96 if (i == 31) {
97 /*
98 * For 128-bytes EDID_1.3,
99 * 1. Add the value of Bytes-126 to Bytes-127.
100 * The Bytes-127 is Checksum. Sum of all 128bytes should
101 * equal 0 (mod 256).
102 * 2. Modify Bytes-126 to be 0.
103 * The Bytes-126 indicates the Number of extensions to
104 * follow. 0 represents noextensions.
105 */
106 ediddata[3] = ediddata[3] + ediddata[2];
107 ediddata[2] = 0;
108 }
109
110 memcpy(buf, ediddata, min((len - i), 4));
111 buf += 4;
112 }
113
114out:
115 /* Signal end of reading */
116 ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5, (u8)~AST_IO_VGACRE5_EDID_READ_DONE,
117 AST_IO_VGACRE5_EDID_READ_DONE);
118
119 mutex_unlock(&ast->modeset_lock);
120
121 return ret;
122}
123
124/*
125 * Launch Aspeed DP
126 */
127int ast_dp_launch(struct ast_device *ast)
128{
129 struct drm_device *dev = &ast->base;
130 unsigned int i = 10;
131
132 while (i) {
133 u8 vgacrd1 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd1);
134
135 if (vgacrd1 & AST_IO_VGACRD1_MCU_FW_EXECUTING)
136 break;
137 --i;
138 msleep(100);
139 }
140 if (!i) {
141 drm_err(dev, "Wait DPMCU executing timeout\n");
142 return -ENODEV;
143 }
144
145 ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5,
146 (u8) ~AST_IO_VGACRE5_EDID_READ_DONE,
147 AST_IO_VGACRE5_EDID_READ_DONE);
148
149 return 0;
150}
151
152static bool ast_dp_get_phy_sleep(struct ast_device *ast)
153{
154 u8 vgacre3 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xe3);
155
156 return (vgacre3 & AST_IO_VGACRE3_DP_PHY_SLEEP);
157}
158
159static void ast_dp_set_phy_sleep(struct ast_device *ast, bool sleep)
160{
161 u8 vgacre3 = 0x00;
162
163 if (sleep)
164 vgacre3 |= AST_IO_VGACRE3_DP_PHY_SLEEP;
165
166 ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe3, (u8)~AST_IO_VGACRE3_DP_PHY_SLEEP,
167 vgacre3);
168 msleep(50);
169}
170
171static void ast_dp_link_training(struct ast_device *ast)
172{
173 struct drm_device *dev = &ast->base;
174 int i;
175
176 for (i = 0; i < 10; i++) {
177 u8 vgacrdc;
178
179 if (i)
180 msleep(100);
181
182 vgacrdc = ast_get_index_reg(ast, AST_IO_VGACRI, 0xdc);
183 if (vgacrdc & AST_IO_VGACRDC_LINK_SUCCESS)
184 return;
185 }
186 drm_err(dev, "Link training failed\n");
187}
188
189static bool __ast_dp_wait_enable(struct ast_device *ast, bool enabled)
190{
191 u8 vgacrdf_test = 0x00;
192 u8 vgacrdf;
193 unsigned int i;
194
195 if (enabled)
196 vgacrdf_test |= AST_IO_VGACRDF_DP_VIDEO_ENABLE;
197
198 for (i = 0; i < 1000; ++i) {
199 if (i)
200 mdelay(1);
201 vgacrdf = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xdf,
202 AST_IO_VGACRDF_DP_VIDEO_ENABLE);
203 if (vgacrdf == vgacrdf_test)
204 return true;
205 }
206
207 return false;
208}
209
210static void ast_dp_set_enable(struct ast_device *ast, bool enabled)
211{
212 struct drm_device *dev = &ast->base;
213 u8 vgacre3 = 0x00;
214
215 if (enabled)
216 vgacre3 |= AST_IO_VGACRE3_DP_VIDEO_ENABLE;
217
218 ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe3, (u8)~AST_IO_VGACRE3_DP_VIDEO_ENABLE,
219 vgacre3);
220
221 drm_WARN_ON(dev, !__ast_dp_wait_enable(ast, enabled));
222}
223
224static void ast_dp_set_mode(struct drm_crtc *crtc, struct ast_vbios_mode_info *vbios_mode)
225{
226 struct ast_device *ast = to_ast_device(crtc->dev);
227
228 u32 ulRefreshRateIndex;
229 u8 ModeIdx;
230
231 ulRefreshRateIndex = vbios_mode->enh_table->refresh_rate_index - 1;
232
233 switch (crtc->mode.crtc_hdisplay) {
234 case 320:
235 ModeIdx = ASTDP_320x240_60;
236 break;
237 case 400:
238 ModeIdx = ASTDP_400x300_60;
239 break;
240 case 512:
241 ModeIdx = ASTDP_512x384_60;
242 break;
243 case 640:
244 ModeIdx = (ASTDP_640x480_60 + (u8) ulRefreshRateIndex);
245 break;
246 case 800:
247 ModeIdx = (ASTDP_800x600_56 + (u8) ulRefreshRateIndex);
248 break;
249 case 1024:
250 ModeIdx = (ASTDP_1024x768_60 + (u8) ulRefreshRateIndex);
251 break;
252 case 1152:
253 ModeIdx = ASTDP_1152x864_75;
254 break;
255 case 1280:
256 if (crtc->mode.crtc_vdisplay == 800)
257 ModeIdx = (ASTDP_1280x800_60_RB - (u8) ulRefreshRateIndex);
258 else // 1024
259 ModeIdx = (ASTDP_1280x1024_60 + (u8) ulRefreshRateIndex);
260 break;
261 case 1360:
262 case 1366:
263 ModeIdx = ASTDP_1366x768_60;
264 break;
265 case 1440:
266 ModeIdx = (ASTDP_1440x900_60_RB - (u8) ulRefreshRateIndex);
267 break;
268 case 1600:
269 if (crtc->mode.crtc_vdisplay == 900)
270 ModeIdx = (ASTDP_1600x900_60_RB - (u8) ulRefreshRateIndex);
271 else //1200
272 ModeIdx = ASTDP_1600x1200_60;
273 break;
274 case 1680:
275 ModeIdx = (ASTDP_1680x1050_60_RB - (u8) ulRefreshRateIndex);
276 break;
277 case 1920:
278 if (crtc->mode.crtc_vdisplay == 1080)
279 ModeIdx = ASTDP_1920x1080_60;
280 else //1200
281 ModeIdx = ASTDP_1920x1200_60;
282 break;
283 default:
284 return;
285 }
286
287 /*
288 * CRE0[7:0]: MISC0 ((0x00: 18-bpp) or (0x20: 24-bpp)
289 * CRE1[7:0]: MISC1 (default: 0x00)
290 * CRE2[7:0]: video format index (0x00 ~ 0x20 or 0x40 ~ 0x50)
291 */
292 ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE0, ASTDP_AND_CLEAR_MASK,
293 ASTDP_MISC0_24bpp);
294 ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE1, ASTDP_AND_CLEAR_MASK, ASTDP_MISC1);
295 ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE2, ASTDP_AND_CLEAR_MASK, ModeIdx);
296}
297
298static void ast_wait_for_vretrace(struct ast_device *ast)
299{
300 unsigned long timeout = jiffies + HZ;
301 u8 vgair1;
302
303 do {
304 vgair1 = ast_io_read8(ast, AST_IO_VGAIR1_R);
305 } while (!(vgair1 & AST_IO_VGAIR1_VREFRESH) && time_before(jiffies, timeout));
306}
307
308/*
309 * Encoder
310 */
311
312static const struct drm_encoder_funcs ast_astdp_encoder_funcs = {
313 .destroy = drm_encoder_cleanup,
314};
315
316static void ast_astdp_encoder_helper_atomic_mode_set(struct drm_encoder *encoder,
317 struct drm_crtc_state *crtc_state,
318 struct drm_connector_state *conn_state)
319{
320 struct drm_crtc *crtc = crtc_state->crtc;
321 struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc_state);
322 struct ast_vbios_mode_info *vbios_mode_info = &ast_crtc_state->vbios_mode_info;
323
324 ast_dp_set_mode(crtc, vbios_mode_info);
325}
326
327static void ast_astdp_encoder_helper_atomic_enable(struct drm_encoder *encoder,
328 struct drm_atomic_state *state)
329{
330 struct ast_device *ast = to_ast_device(encoder->dev);
331 struct ast_connector *ast_connector = &ast->output.astdp.connector;
332
333 if (ast_connector->physical_status == connector_status_connected) {
334 ast_dp_set_phy_sleep(ast, false);
335 ast_dp_link_training(ast);
336
337 ast_wait_for_vretrace(ast);
338 ast_dp_set_enable(ast, true);
339 }
340}
341
342static void ast_astdp_encoder_helper_atomic_disable(struct drm_encoder *encoder,
343 struct drm_atomic_state *state)
344{
345 struct ast_device *ast = to_ast_device(encoder->dev);
346
347 ast_dp_set_enable(ast, false);
348 ast_dp_set_phy_sleep(ast, true);
349}
350
351static const struct drm_encoder_helper_funcs ast_astdp_encoder_helper_funcs = {
352 .atomic_mode_set = ast_astdp_encoder_helper_atomic_mode_set,
353 .atomic_enable = ast_astdp_encoder_helper_atomic_enable,
354 .atomic_disable = ast_astdp_encoder_helper_atomic_disable,
355};
356
357/*
358 * Connector
359 */
360
361static int ast_astdp_connector_helper_get_modes(struct drm_connector *connector)
362{
363 struct ast_connector *ast_connector = to_ast_connector(connector);
364 int count;
365
366 if (ast_connector->physical_status == connector_status_connected) {
367 struct ast_device *ast = to_ast_device(connector->dev);
368 const struct drm_edid *drm_edid;
369
370 drm_edid = drm_edid_read_custom(connector, ast_astdp_read_edid_block, ast);
371 drm_edid_connector_update(connector, drm_edid);
372 count = drm_edid_connector_add_modes(connector);
373 drm_edid_free(drm_edid);
374 } else {
375 drm_edid_connector_update(connector, NULL);
376
377 /*
378 * There's no EDID data without a connected monitor. Set BMC-
379 * compatible modes in this case. The XGA default resolution
380 * should work well for all BMCs.
381 */
382 count = drm_add_modes_noedid(connector, 4096, 4096);
383 if (count)
384 drm_set_preferred_mode(connector, 1024, 768);
385 }
386
387 return count;
388}
389
390static int ast_astdp_connector_helper_detect_ctx(struct drm_connector *connector,
391 struct drm_modeset_acquire_ctx *ctx,
392 bool force)
393{
394 struct ast_connector *ast_connector = to_ast_connector(connector);
395 struct ast_device *ast = to_ast_device(connector->dev);
396 enum drm_connector_status status = connector_status_disconnected;
397 bool phy_sleep;
398
399 mutex_lock(&ast->modeset_lock);
400
401 phy_sleep = ast_dp_get_phy_sleep(ast);
402 if (phy_sleep)
403 ast_dp_set_phy_sleep(ast, false);
404
405 if (ast_astdp_is_connected(ast))
406 status = connector_status_connected;
407
408 if (phy_sleep && status == connector_status_disconnected)
409 ast_dp_set_phy_sleep(ast, true);
410
411 mutex_unlock(&ast->modeset_lock);
412
413 if (status != ast_connector->physical_status)
414 ++connector->epoch_counter;
415 ast_connector->physical_status = status;
416
417 return connector_status_connected;
418}
419
420static const struct drm_connector_helper_funcs ast_astdp_connector_helper_funcs = {
421 .get_modes = ast_astdp_connector_helper_get_modes,
422 .detect_ctx = ast_astdp_connector_helper_detect_ctx,
423};
424
425/*
426 * Output
427 */
428
429static const struct drm_connector_funcs ast_astdp_connector_funcs = {
430 .reset = drm_atomic_helper_connector_reset,
431 .fill_modes = drm_helper_probe_single_connector_modes,
432 .destroy = drm_connector_cleanup,
433 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
434 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
435};
436
437int ast_astdp_output_init(struct ast_device *ast)
438{
439 struct drm_device *dev = &ast->base;
440 struct drm_crtc *crtc = &ast->crtc;
441 struct drm_encoder *encoder;
442 struct ast_connector *ast_connector;
443 struct drm_connector *connector;
444 int ret;
445
446 /* encoder */
447
448 encoder = &ast->output.astdp.encoder;
449 ret = drm_encoder_init(dev, encoder, &ast_astdp_encoder_funcs,
450 DRM_MODE_ENCODER_TMDS, NULL);
451 if (ret)
452 return ret;
453 drm_encoder_helper_add(encoder, &ast_astdp_encoder_helper_funcs);
454
455 encoder->possible_crtcs = drm_crtc_mask(crtc);
456
457 /* connector */
458
459 ast_connector = &ast->output.astdp.connector;
460 connector = &ast_connector->base;
461 ret = drm_connector_init(dev, connector, &ast_astdp_connector_funcs,
462 DRM_MODE_CONNECTOR_DisplayPort);
463 if (ret)
464 return ret;
465 drm_connector_helper_add(connector, &ast_astdp_connector_helper_funcs);
466
467 connector->interlace_allowed = 0;
468 connector->doublescan_allowed = 0;
469 connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
470
471 ast_connector->physical_status = connector->status;
472
473 ret = drm_connector_attach_encoder(connector, encoder);
474 if (ret)
475 return ret;
476
477 return 0;
478}